[Milliner]

I guess Volvo would be a bit twitchy about using GPS to determine whether a car is in the garage or not for the reasons highlighted.

Geo-fencing a given area (say, once parked in the garage) might help, but I suspect there'd be some disclaimers involved and you'd accept liability if it was on the drive, unlocked, and got nicked.

That said, looking at the latest story on keyless car thefts today, is it all a bit of a chocolate fireguard anyway??